Feat: Refact pipeline (#13826)

### What problem does this PR solve?

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Refactoring

---------

Co-authored-by: Zhichang Yu <yuzhichang@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

api/db/services/user_canvas_version.py

@@ -2,6 +2,7 @@ import json
 import logging
 import time
 
+from agent.dsl_migration import normalize_chunker_dsl
 from api.db.db_models import UserCanvasVersion, DB
 from api.db.services.common_service import CommonService
 from peewee import DoesNotExist
@@ -30,7 +31,7 @@ class UserCanvasVersionService(CommonService):
             raise ValueError("DSL must be a JSON object.")
 
         try:
-            return json.loads(json.dumps(normalized, ensure_ascii=False))
+            return json.loads(json.dumps(normalize_chunker_dsl(normalized), ensure_ascii=False))
         except Exception as e:
             raise ValueError("DSL is not JSON-serializable.") from e